Design, analysis, and implementation of a high-gain quasi-switched boost inverter for renewable energy applications

The increasing demand for efficient renewable energy conversion highlights the importance of advanced inverter technologies, particularly those capable of boosting DC voltage while converting it to AC. Conventional inverters face limitations in addressing challenges such as voltage stress, inrush current, and input current continuity. To address these gaps, this study introduces a modified quasi-Z-source inverter (qZSI) structure employing a quasi-switched boost inverter (qSBI). The proposed inverter achieves a high boost factor with a minimal shoot-through interval and a high modulation index, ensuring superior performance. Key features include continuous input current, reduced voltage stress on switches, and negligible input voltage ripple, along with the elimination of initial inrush current typically associated with impedance source inverters. Comprehensive operational analyses and parameter-based comparisons with similar inverters confirm the advantages of the proposed design. Experimental validation demonstrates its accuracy and effectiveness, underscoring its potential to enhance renewable energy systems through improved performance and reliability. Keywords: boost factor; inrush current; modulation index; switched boost inverter; quasi-Z-source inverter